Dear laurin, I am out now so i cant check the case9 but regarding your second question i should say u don't have to have Q in branches. The susceptance comes from pi model in branch modeling and Q originates from the capacitance of lines with the ground. I hope that it helps. Regards
Sent from my iPhone On 17 Aug 2012, at 14:03, Laurin Vierrath <[email protected]> wrote: > hi Iman, > > thank you so much for your quick response. I still have some questions which > I want to post: > > so just as an example (values are taken from case9): > > mpc.baseMVA = 100; > voltage of reference bus (or which voltage do i have to take?): 345kV > > -> Z_base = 119.0250 > > my branch is > "4 5 0.017 0.092 0.158 250 250 250 0 0 1 > -360 360;" > > so i take > > Z_pu = 0.017 + 0.092i > > Z_pu * Z_base = 2.0234 +10.9503i > > So R = 2.0234 and X = 10.9503? > > For b I dont know what to do because there's no Q in the branch matrix, > online in the bus-matrix? > > thank you in advance, > > laurin > > > Am 17.08.2012 14:36, schrieb iman: >> Dear Laurin >> First calculate the impedance for R and X.You will have Z p.u =R+JX.Then >> multiply it by Z base which is calculated by Z base=V^2/S in which V and S >> are the base voltage and apparent power of the system respectively.In the >> end multiply Z p.u by Z base to get the actual value. >> In per Unit system Q injected to buses is the same as susceptance .So Bs >> p.u=Q inj P.u. Simply multiply it to S base to get the actual Q injected. >> Hope that it is understandable >> Regards >> Iman >> >> On Fri, Aug 17, 2012 at 1:21 PM, Laurin Vierrath <[email protected]> >> wrote: >> hi there, >> in mpc.branch there are columns defining r, x and b. those values are "per >> unit". what do i have to do or how do i have to calculate to get the actual >> value of r, x and b? >> thank you! >> laurin >> >> >> >> -- >> Best regards >> Iman >> >
